Submission #1084121

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084121		ZeroCool	Global Warming (CEOI18_glo)	C++14	100 / 100	88 ms	6996 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define ar array

const int LOG = 20;
const int MOD = 1e9 + 7;
const int INF = 1e18;

const int N = 2e5 + 20;


int A[N];
int pref[N];
    
signed main() {
    int n,x;
    cin>>n>>x;
    for (int i = 0; i < n; i++)cin >> A[i]; 
    int dp[n];
    for(int i = 0;i < n;i++)dp[i] = INF;
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int j = lower_bound(dp, dp + n, A[i]) - dp;
        dp[j] = A[i];
        pref[i] = j + 1;
        ans = max(ans, pref[i]);
    }
    
    for(int i = 0;i < n;i++)dp[i] = INF;
    for (int i = n - 1; i >= 0; i--) {
        int j = lower_bound(dp, dp + n, -A[i] + x) - dp;
        ans = max(ans, pref[i] + j);
    
        int k =lower_bound(dp, dp + n, -A[i]) - dp;
        dp[k] = -A[i];
    }
    cout<<ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25